1Deversince 后面的從句用一般過去時(shí)
2Bbut 連接的是兩個(gè)并列的分句 ,所以but 前后連接的兩個(gè)句子的時(shí)態(tài)應(yīng)該一致,所以選B 用過去時(shí)的被動(dòng)語(yǔ)態(tài)
3A句子的主語(yǔ)應(yīng)該是the letter"u" 所以謂語(yǔ)動(dòng)詞要用單數(shù) 選B
1.Ever since Dolly,the sheep ___in 1997,many scientists have been working on cloning a human being.
1.Ever since Dolly,the sheep ___in 1997,many scientists have been working on cloning a human being.
A had cloned B has been cloned Cwould cloned D was cloned
2.The theory ___ about in 1514,but the csirntist only published it just defore his death in 1543.
Ahad put forward Bwas put forward
3.In American English,the letter"u" in some words,such as colour,___
Ais dropped Bare dropped
正確答案是D B A 但理由是什么？
A had cloned B has been cloned Cwould cloned D was cloned
2.The theory ___ about in 1514,but the csirntist only published it just defore his death in 1543.
Ahad put forward Bwas put forward
3.In American English,the letter"u" in some words,such as colour,___
Ais dropped Bare dropped
正確答案是D B A 但理由是什么？
英語(yǔ)人氣：728 ℃時(shí)間：2019-10-27 12:01:41
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